Module metrics 

Re-exports

pub use crate::semantic::SemanticIndex;

Modules

exemplars 🔒

prepare 🔒

resource_info 🔒

Resource descriptor synthesized from OTLP metrics requests, so the entity graph reads one table instead of scanning every logical metric table for attributes the promote filter may have dropped.

translator 🔒

Structs

DEFAULT_PROMOTE_ATTRS_SET 🔒

MetricMetadata 🔒

MetricsConversion

Result of converting one OTLP metrics request.

PreparedMetrics

Rows share exact input schemas while retaining their source-point boundaries.

ServiceIdentity 🔒

Prometheus-style (job, instance) identity. Per the OTel Prometheus compatibility spec job folds in service.namespace when present; a resource without service.name gets no job rather than a fabricated one. Both fields are optional strings, so a named type keeps a swapped destructuring from type-checking at the call sites.

Enums

AttributeType 🔒

ExponentialHistogramRejection 🔒

Constants

APPROXIMATE_COLUMN_COUNT 🔒

the default column count for table writer

BUCKET_TABLE_SUFFIX 🔒

COUNT_TABLE_SUFFIX 🔒

DEFAULT_PROMOTE_ATTRS 🔒

HISTOGRAM_LE_COLUMN 🔒

INSTANCE_KEY 🔒

JOB_KEY 🔒

MAX_EXPONENTIAL_HISTOGRAM_SCALE 🔒

MAX_REJECTION_MESSAGE_BYTES 🔒

MIN_EXPONENTIAL_HISTOGRAM_SCALE 🔒

OTEL_RESOURCE_INFO_TABLE_NAME

Prefixed like the other engine-managed tables, so a user metric is unlikely to claim the name.

OTEL_SCOPE_NAME 🔒

OTEL_SCOPE_SCHEMA_URL 🔒

OTEL_SCOPE_VERSION 🔒

SUM_TABLE_SUFFIX 🔒

Functions

add_accepted_data_points 🔒

append_rejection_message 🔒

convert_bucket_range 🔒

downscale_bucket_index 🔒

emitted_semantic_tables 🔒

The tables a metric emits and their per-table metric.type. Histogram fans out into _bucket (the histogram) plus _sum/_count counters; summary fans out into the quantile table plus _count/_sum counters.

encode_exponential_histogram 🔒

encode_gauge 🔒

encode this gauge metric

encode_histogram 🔒

Encode histogram data. This function returns 3 insert requests for 3 tables.

encode_metrics 🔒

encode_sum 🔒

Encodes sums, preserving delta points as interval values with a temporality tag. Ingestion is stateless: values are never accumulated across timestamps.

encode_summary 🔒

exponential_histogram_gate 🔒

Validate temporality before processing points; delta values remain raw intervals.

exponential_histogram_value 🔒

from_metric_type 🔒

has_no_recorded_value 🔒

histogram_data_point_rejection 🔒

prepare_metrics

process_resource_attrs 🔒

process_scope_attrs 🔒

record_metric_semantics 🔒

Records the declared metric-level semantic keys for every table this metric emits.

reject_data_points 🔒

scalar_value_string 🔒

Non-scalar values (arrays, maps, bytes) are not representable as tags.

service_identity 🔒

string_key_value 🔒

temporality_value 🔒

Maps OTLP aggregation_temporality to the semantic value, or None when the instrument has no temporality (gauge/summary) or it is unspecified.

timestamp_millis 🔒

to_grpc_insert_requests

Converts OpenTelemetry metrics without validating destination table schemas. Ingestion callers use prepare_metrics, run destination preflight, then call PreparedMetrics::finish to apply rejections and merge surviving points.

validate_sample_kind 🔒

write_attributes 🔒

write_data_point_value 🔒

write_tags_and_timestamp 🔒

write_temporality_tag 🔒

write_timestamp 🔒